Control device



June 20, 1933.

L. w. EGGLESTON ETAL 1,914,771

CONTROL DEVICE Filed March 5, '1928 's Sheets-Sheet 1 a gwue xtozs June 20, 1933. w. EGGLE STOh l ET AL 1,914,771

CONTROL DEVI CE 3 Sheets-Sheet 2 Filed March- 5, 1928 we 23w June 20, 1933. L, w EGGLESTON ET AL 1,914,771

CONTROL DEVICE Filed March 5, 1928 3 Sheets-Sheet 5 awvewtozs Patented June 20, 1933 UNITED STATES PATENT OFFICE LEWIS W. EGGLESTON AND EARNEST J. DILLMAN, OF DETROIT, MICHIGAN, ASSIGNORS TO AMERICAN RADIATOR COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY CONTROL DEVICE- Application filed March 5, 1928, Serial No. 259,098.

Our invention relates to new and useful improvements in control devices, and more particularly to a temperature controlling device adapted, among other uses which are .5 apparent, to be embodied particularly in a house or room heating system to control the same. In order to insure physical comfort and healthful living conditions, it is desirable to maintain a constant, or a substantially constant, house temperature during certain periods of the day, for example, the Waking and the sleeping hours of the household, for which purpose our invention. will be found adaptable as one of the uses of which it is capable.

An object of our invention is to provide a device of simple construction, which may be employed in connection with a-house or other heating system to control the same to maintain a desired temperature condition.

Another object is to provide a control device of the type mentioned which is adapted at. predetermined'hours, or after a predetermined lapse of time, to regulate automatically a thermoscnsitive means for response to pre letermined temperatures to effect a desired control, as will be apparent from the following specification.

The invention. consists in the'novel construction and combination of parts, to be more fully described hereinafter, and the novelty of which will be particularly pointed out-and distinctly claimed.

In the accompanying drawings, to be taken as a part of this specification, we have fully and clearly illustrated a preferred embodiment of our invention, in which drawings' Figure l is a view in front elevation of, our control device, with the mechanism enclosing casing removed;

Fig. 2 is a view in front elevation shown in section on the line. 22 of Fig. 3;

Fig. 3 is a view in side elevation with the mechanism enclosing cover in place, but shown in vertical, central sect-ion;

members Fig. 4 is a detail in front elevation, and partially in section, of certain regulating mechanism i Fig. 5 is a plan View of the mechanism shown in Fig. 4

Fig. 6 is a detail in section on the vertical center line of Fig. 1;

Fig. 7 is a detail of certain spring motor means shown in section on the vertical center line of Fig. 1; 4

Fig. 8 is a detail of a release lever; F igs. 9 and 10 are details of certaln cam Fig. 11 is a detail, end view of a sleeve element Fig. 12 is a detail, plan view of a rocking .lo'w spacer bars 5 through which and. the

plates 2, 3 are passed fastening bolts 6 having nut. 7.

Between and transverse to the plates 2', 3 is a substantially vertical, arcuateplate 8, which laterally abuts the back plate 3 and has lugs or pins 9 projecting from its side face through openings 10 in plate 3,'Whereby the plate 8 will be held rigidly in position. The plate 8 is vertically slotted, as at 11, for

a purpose to be described. From the other side face of plate 8 extends a substantially Vertical arcuate guide rail 12,- the bearing face 13 of which lies in a plane substantially parallel to plates 2, 3. Projecting from the rail 12 is a substantially horizontal bracket arm 14 which is substantially perpendicular to the plates 2, 3, and which has .a transverse flange 15 at its free end which abuts the front plate 2. The flange 15 is secured to the plate 2 in any suitable manner, but preferably by means of a screw 16 passed through an opening in plate 2 and threaded into an opening 17 in flange 15.

Positioned between plates 2, 3 is a temperature responsive device or thermostat 18, which is preferably in the form of an .hermetically sealed chamber having a movable head or end wall 19, a base member 20, and a resilient, expansible-collapsible, cylindrical side wall 21 having circumferential corrugations, and being preferably in the form of a metal bellows. The cylindrical side wall 21 is hermetically sealed at its ends by solder, or the like, respectively to the head 19 and the base or bottom member 20, as at 19 and 20. Through the base member 20 is an opening 22 in which is secured, as by burnishing, or the like, one end of an externally threaded tubular support member 23. The free end of the member 23 is passed through an opening 24 in the arm 14 and tightly clamped thereinby a nut 25 to rigidly secure the'thermostat 18 at its bottom end 20 to thearm 14. The thermostat is charged though the tubular member23 with a suitable volatile which will expand and contract in response to changes of temperature to exert pressures proportional thereto upon and to move the movable head or end wall 19. When the thermostat has been charged the member 23 is sealed, as at 26.

Secured to the back plate 3 by rivets 27, or the like, is a bracket 28 having a depending flange 29 through which is an aperture 30 having a fulcrum notch 31 (see Figs. 2 and 5). Fixed to the front plate 2 by rivets 32, or the like, is a depending bracket member 33 having a side edge thereof notched, as at 34 (see Figs. 1 and 5). The apices of the notches 31 and 34 are in a line substantially perpendicular to plates 2, 3, but the notches are oppositely faced, as is apparent from Figs. 1 and 2. Between the brackets 28 and 33 is a lever member 35, preferably of the bell-crank type, having arms 36, 37. each side of the member 35 and substantially at the point where the arms 36, 37 are joined, is a lug 38, 39, each lug having a knife edge, designated 40, 41, each of which respectively engages one of the fulcrum notches 31 and 34. Depending from arm 36 is a flange 42, through which is adjustably threaded a pin or abutment member 43 having a lock nut 44 and a conical end 45 which engages a conical recess 46 in the end wall 19 of the thermostat 18. Projecting from the back plate 3 adjacent the opposite side of the frame 1 from the arcuate plate 8 and slightly below a horizontal plane through notches 31 and 34 is a bearing pin 47 on which is journaled a regulating lever 48 having at its free end a pointer or indicator finger 49 which projects through the slot 11 of arcuate plate 8. On the outside face of the plate 8 is secured in any suitable manner a scale plate 8 bearing indicia 50 indicating a range of temperature for cooperation with the pointer 49. Also at the free end of the lever 48 is a lateral flange 51 which is apertured, as at 52, to receive the shank of an adjusting screw 53. Beneath the head of the screw 53 is an enlarged cylindrical bearing portion 54 forming a shoulder 55 which abuts the'flange 51. .Mounted for free rotation on the portion 54, is a guide roller 56 which engages the surface 13 of the guide rail 12. Secured to the bell-crank arm 36, in any suitable manner, but preferably by engagement with a hook portion 36 thereof, is one end of a spring member 57, preferably of the coil type. At the free end of the spring member 57 the coils of the spring are compressed into abutting relation, as at 58,

to form a screw thread into which is screwed an externally threaded plug 59 having a threaded bore 60 therethrough. The screw 53 extends through the bore 60 in threaded engagement therewith for adjustment of the tension of spring member 57. The fulcrum notches 31 and 34 are oppositely faced, as

above described, in order to provide a proper bearing for lever 35, due tothe tendency of the spring member 57 to rotate the lever in a 'clockwise direction of Fig. 5. It will be seen that the lever 48 serves as an adjustable support for the spring 57.

Secured on the inside face of the plate 8 is a rack 61 having notches 62 adjacent the slot 11, preferably one notch for. each scale marking. Projecting from the inside face of the plate 3 is a pin 63, on which are journaled a pair of laterally resilient stop levers 64, 65. Each of the levers 64, 65' extends along plate 3 to a point adjacent arcuate plate 8, Where each lever has, respectively, a laterally extending stop portion proper 66, 67 which extends across the path of movement of the indicator finger49 and-respectively above and below the same. From eaeh stop portion 66, 67 a hand grip por tion 68,69, respectively, extends through the slot 11, and on each of these portions 68, 69 is a pointer 70, 71 for cooperation with the indicia 50 and the indicator finger 49. On each lever 64, 65 is a tooth or dog 72, 73, which is normally held'in engagement with a notch 62 on the rack 61 .to which it has been moved by the resilience of the lever.

Each of the levers 64, 65- is offset, as at 74, i

its engagement on" upward 'or downward] device, designated generally at 79, Fig. 2.'

This device79 comprises a supporting frame 80 having transverse frame members 81, 82,

which are rigidly secured together in any suitable manner, as by rivet 80 Depending.

from the member 81 (see Figs. 2, 3 and 12) are lugs 83, 84 having bearing openings 83*, 84,through which the shaft 78 freely passes, and laterally from the lug 84 extends a bifurcated operating and stop member 85,"having substantially parallel arms 85*, 85". The arm 85 is of greater length than arm 85 and projects through a COOPGI'fitlIlQ' stop opening 86 in plate3 to limit the roc ring or tilting movement of the device. On the shaft 78 are spacer sleeves 87 88 to maintain the member 81 longitudinally in position on the shaft. The free end of the bell-crank arm 37 extends u'pward into the slot 89 formed between arms 85 and 85* for operative connection of the thermostat 18 to the device 79. Depending from the ends of the member 82 are spring clamping fingers or jaws 90 which rigidly but removably support a mercury switch on the supporting frame 80. The switch comprises a sealed glass tube 91 having contact points 92therein, from which electric conductors 93 lead through an opening 94, the plate 3,being held in an outlet supporting and ,insulating block 94 secured to the plate 3. Within the tube is a globule of mercury 95 which is flowed into or out of contact with the points-92 as the tube 91 is tilted or rocked on shaft 78 to make or break an electric circuit. e

The front plate 2 has a crossbar 2, and in thebar 2 and the back plate 3 are oppositely disposed bearing openings 96, 97, respectively, see particularly Fig. 7. In the opening 97 is a rotatable bushing or sleeve 98 having a rectangularportion 99 intermediate its cylindrical. ends which form I shoulders 100, 100, the shoulder -100 abutting the plate 3. A shaft 101 extends through and is journale'd in thebearing opening 96 and has one end, which is slotted, as 211 102, projecting into the sleeve 98. On the free end of the sleeve 98 is mountecla leverv 103 which abuts shoulder 1.00 and has a lug 104 projecting laterally therefrom which overlies one of the sides of the rectangular portion 99. Through the lug 104, sleeve 98, and slot'102, is passed apin. 105 which rigidly secures these members together. The lever 103 may be further fixed totthe sleeve 98 by burnishing the end of the sleeve over onto the lever, as at 106.

' The lever 103 extends to a point adjacent the free end of the regulating lever 48 to which it is connected b a link 107, which is pivoted at-its oppositeends by pins 108, 109 to the freeends of the levers 103 and 48, respectively. On the shaft 101 is a washer 110 which abuts the inside face of the cross-bar 2 of plate2, and which is held in position by a'pin 111 passed through a hole 112 in the shaft. The washer 110 and'the shoulder 100 cooperate with the plates 2, 3, respectively, to hold the shaft 101 against endwise movement. The shaft 101 projects from the front or outer side of plate 2, as at 113. Surrounding the end 113 of shaft 101, is a substantially cylindrical casing 114 having an apertured base 115 through which shaft 101 passes, and which lies against the outside face of crossbar 2. The casing 114 isiixed against rotation preferably by means of pins 116, which project from base 115 and lie above and belowthe bar 2 (see .Fig. 3). Projecting from the'base115 into the casing 114 is a lug 117, to which is secured the inner end of a spiral spring 118, the outer end thereof being fixed to a lug 119 carried by a lever 1 member 120 which is j ournaled on shaft 101.

The turns of the spiral spring 118 run from the center outward m a clockwise direction, see Fig. 4, so that movement of the lever 120 clockwise, or fromleft to right of Fig. 4, will tension or wind up the-spring. On the shaft end 113 is rigidly secured for rotation with the shaft, a ratchet drive wheel 121 having teeth 122. Pivotedon the lever member 120- by means 'of a pivot pin 123, is a pawl 124 having a ratchet tooth engaging dog 125 and a lever arm 126 which extends along the lever member 120 but terminates, as at 127, just short of the free end 128 of member 120,

for a purpose to be described. Secured on the plate 2 is a stop pin 120 which projects ,into the path of movement of the lever 120 and the .pawl arm126, to limit counterclockwise rotation of the lever 120. Projecting from the dog 125 to a point between plates 2,

normally tending to urge the dog 125 into en- I gagement with the ratchet teeth 122. P1voted on a pin 132 fixed to and projecting inwardly from plate 2, is abell-crank'lever 133, see Figs. 1 and 8, having a trip arm 134 and an operating arm 135. The arm 134 is sub stantially arcuate and lies beneath the dog release pin 129 and is adapted upon clockwise rotation to engage the pin 129 and lift the dog 125 from engagement with teeth 122.

Supported on the back plate 3 by means of screws 136,. or the like, is a clock mechanism containing casing 136*, the mechanism being of any suitable type, preferably having an eight clay clock movement which 18 an accurate time keeper, and having a mechanism starting and stopping lever 137 operable be- 7 tween stops 138,139 and movable in the direction of the indicator arrow at to release and start the clock mechanism. A clock spring winding shaft 140 projects through the casing 136 for cooperation with a spring winding key. The usual clock regulating lever is shown at 141.

The mainclock shaft 142 projects substantially centrallyfrom the casing 136 the free end thereofbeing tapered, as at '143, and having an axial, internally threaded recess 144. On the tapered end of shaft 142, see Fig. 6, is a sleeve 145 having a tapered bore 146 which is forced into tight frictional engagement with tapered portion 143 of the shaft 142 for positive rotation therewith, by the head 147 of a screw member 147 which is threaded into the recess 144, the head 147 being knurled circumferentially, as at 147 to serve as a hand grip. The sleeve 145, see

Figs. 6 and 11, is substantially square in crosssection, the corners being rounded, as at 148, as arcs of a circle of greater diameter than the length of a side of the square to provide fiat portions 148 intermediate the arcs 148. The curving of the corners terminates adjacent one end of the sleeve to provide ears or abutments 148". The other end of the sleeve 145 is cylindrical, as at 149,-to' receive a and the washer 150, is a dial plate 152, cam

levers 153, 154 and-a cam lever setting plate 155. The dial plate 152 and the cam plate 155 are each provided with a central open ing 156, 157, respectively, which are substantially square, so that the sides of the openings 156, 157 engage the flat port-ions 148 of the sleeve 145 to lock the 'plates 152, 155 against rotation relative to the sleeve. The levers 153, 154 are each journaled onthe sleeve 145 and have circular openings 158, 159, respectively, to cooperate with the rounded arcuate corners 148. Thedial plate 152 has indicia 160, preferably twenty-four equally spaced markings numbered in two series from one to twelve, each series having a suitable legend 161 indicating M. and P. M. hours respectively. The cam plate 155 has a surrounding ring member 162 spaced therefrom and secured thereto by arms or spokes 163 providing segmental openings 164. The ring member 162 has a plurality of equally spaced apertures 165, preferably forty-eight in numher, every other aperture 165 being in the radial line of one of the indicia markings 160. The lever 153 has at its free end a pm 166 on which is rotatably mounted a cam roller 167,

- which upon rotation of the lever 153 by the clock mechanism contacts the free end 128 of the lever 120 and the free end 127 of the ratchet arm 126. Extending from the lever 153 adjacent itsmounting on sleeve 145 and at an acute angle thereto, preferably substantially 45 degrees, is an adjustment arm 168 which overlies the ring member 162 and has projecting therefrom a pin 169 adapted to enter any of the apertures 165 to lock the lever 153 in adjusted position. The lever 154 has at its free end a cam pin 170 which pro- .jects through one of the segmental openings 164, such that upon rotation of the lever 154 by the clock mechanism the pin 17 0 will contact the operating arm 135 of the bell-crank trip lever 133. Extending from the lever 154 adjacent its mounting on sleeve 145 and at an acute angle thereto, preferably substantially 45 degrees, is an adjustment arm 171 which overlies the ring member 162 and has projecting therefrom a pin 172 adapted to enter any of the apertures 165 to lock the lever 154 in adjusted position.

A cover member 173 may be employed to enclose the control device, the edge 174 of the cover member seating on the surrounding flange 4 of the plate 3. The cover member 173' is preferably provided with a circular opening 175 through which the dial plate 152 is visible. Lugs 176 and spring fingers 177 carried by the plate 3-are preferably pro- .vided which cooperate with openings in the cover member 173 to removablysecure it to the plate 3.

The operation of our control device as embodied in a house heating system, which I desire it to be understood is solely for the purpose of illustration, is as follows: The control device is suitably mounted by means of the back plate 3 in a room or other portion of a house'which is a criterion of the temperature desired to be maintained therein, and the electric leads 93 are connected to any suitable electric operating mechanism (not shown), such as a solenoid or an electric motor, etc., which is connected to and adapted to operate any or all of the controls (not shown), for example, the dampers or blower fan, or fuel feed means of the house heating furnace.

The thermosensitive device or bellows 18 expands and contracts in response to rise and fall in temperature of'the medium with which it is surrounded, which in the instant illustrative case is the air within the room containing the control device. In the drawings, the device 18 is shown as having expanded against the resistance offered thereto by the tension spring 57, and having rotated the lever 35 clockwise of Fig. 2 and tilted or rocked the make-and-break device 79 in a counterclockwise direction on its fulcrum 78 to flow the mercury 95 away from contacts 92 to break the circuit through leads 93 to the electric operating mechanism which thereby decreases the heat supplied by the furnace. As the room cools, the device 18 will contract and the spring 57. will act through lever 48 to tilt switch device 79 on its fulcrum 78 to make the circuit at contacts 92 to increase the room heat. The spring 57 does not exert its full force in opposition to expansion of device 18, but only a component ,of its force due to the acute angle which its longitudinal center line makes with the lever arm 36. when upon a rise of room temperature the pressure of the volatile within the bellows 18, assuming the same to have been contracted due to cool room temperature, reaches a value whlch is equal to the resistance oflered thereto by the component of 'force of spring 57 'then the slightest increase however, be suflicient to rotate the lever 35 through its complete range of movement'to the position of Fig. 2. This result of obtaining a very quick substantially snap action of the device 79 without spring 57 crossing the fulcrum point of lever 35, will be appar cut when the forces and angles are considered diagrammatically in parallelograms of forces, as-shown in Fig. 13. When the bellows 18 is collapsed or contracted, the tension of the spring 57 may be indicated by the line a.'c, and the angle of application ofspring 57 to lever 36' as 5 0-0, which gives a component of force exerted by the spring 57 against movement of lever 36 by the device 18 as line 5-0. When' the device 18 has expanded and has moved lever 36 through itscomplete range of movement to the position of Fig. 2, the tension of the spring will be increased, as indicated by line ac, but movement of lever 36 will decrease the angle between the spring and the lever to the angle f-,a'e, and the component of force exerted by spring 57 against movement of lever 36 will be line fe, which, together with the force line df is substantially equalto the line 5-0. The line J-f represents the increase in resistance to the movement of the Y lever 36 through its movement caused by the stiffness of the walls of the collapsible ex pansible element 18. Therefore,'since the vforce lines d-c and b-'c are substantially equal at the extremes of movement of spring 57, and since the same is truefor all points intermediate the, extremes, it is evident that :the resistance tomoveme'n't of the lever 36 is not increased.

' .The regulating lever 48 is manually ad-- justable by means of the stop levers 64. 65, which maybe flexed rearwardly toward plate 3 to disengage dogs 72, 73, respectively, from notches 62, whereupon the levers may be moved separately onthe fulcrum pin 63 within the length of slot 11. When thelever 48 is in the position of Fig. 2, the finger 49 isresting in its lowei'most position upon the stop portion proper 67 of lever 65, and upward movement of lever 65 will carry with it lever, 48 and the end 58 .of spring 57, which will decrease the angle of application of spring 57' upon lever arm 36 and proportionally decrease the resistance of spring 57 to expansion of the device 18. If lever 48 be moved upward till finger 49 is in engagement with stop lever 64, then the device 18 will tional toapressure corresponding to a temperature of 60 degrees and will maintain act against a resistance exerted by the component of. force of spring 57, which 18 proporthe switch device 79 in the position of Fig.

2until the room temperature drops slightly below 60 degrees when spring 57 will act to collapse device 18 to tilt device 79 to make the circuit through leads 93. Theregulating lever 48.is normally held against the stop lever 65 by'the spring 57 which exerts a component of its force upon the lever 48, the angle of application of the spring force being determined by lines, not shown, passed through points 51.to 36 and 51 to 47, Fig. 2.

We have provided means which are adapted to automatically set or regulate the resistance of the spring 57 to expansion of the thermosensitive means 18 and the movement of the switch device 79 thereby, as follows: When the clock mechanism 136 has been wound up by means of shaft 140 and released by moving lever 137 against stop 139, the shaft 142 will be rotated in a counter-clockvwise direction of Fig. 1, carrying with it the levers 153 and 154 with their respective cam pins 166 and 170. These pins 166, 170 may be manually set by flexing outwardly from ring 162 their respective adjustment arms 168, 171 to release pins/169, 172 from apertures 165 when the arms maybe separately rotated with their attached levers until the arms 168, 171 are at the desired hours on the dial plate 152. If the arms 168, 171 are now released, the pins 169, 172 will respectively seat and lock in the alined apertures 165, the

- high temperature cam 170 being shown positioned to operate the regulating spring 57 at 6 oclock in the morning, and the-low temperature cam 168 being shown positioned to operate the regulating spring 57 at ten oclock at night.

In the drawings, the control device is shown as operating at the day or high temperature, that is, the component of-force which spring 57 is exerting against expansion the lever 153, the lever 153 will turn lever member 120 and pawl arm 126 about the shaft 101 in a clockwise direction, thereby gradually winding up motor spring 118 until the hour for setting lever 48 and spring 57 arrives, which hashere been made ten oclock P. M. A few minutes before ten oclock the cam roller 167 rides off the end. 127 of pawl arm 126, permitting spring 131 to move dog 125 into engagement with a ratchet tooth 122, which positively connects the spring 118 to the shaft 101. At the hour of ten oclock the cam roller 167 rides off the end 128 of lever member 120, which permits the energy stored in the spring 118 to rotate the ratchet wheel 121 and its shaft 101 in a counter-clockwise direction of Fig. 1, the rotation of the shaft 101 acting through lever 103 and link 107 to pull upward on regulating lever 48 and swing it counter-clockwise on its pivot pin 47 until the finger 49 abuts the stop portion proper 66 of the stop lever 64 which has here been set at 60 degrees. As the lever 48 is moved it carries with it the end 58 of regulating spring 57, thereby decreasing the angle of application of the spring 57 on the bell-crank lever arm 36, and which decreases the component of force exerted by the spring 57 against movement of lever 35 under expansion of the thermostat 18. Therefore, the thermostat 18 will have suflicient internal pressure, as the room cools, to oppose the component of force of the spring 57 and maintain the switch device 7 9 in its off position, i. e., that of Figs. 1 and 2, until the roomtemperature drops to 60 degrees when the internal pressure of device 18 will be overcome by spring 57, which will collapse the bellows wall 21 and tilt device 7 9 on its fulcrum 78 with substantially to turn on the heat. In this position the spring 57 will 'be overcome by the internal pressure of the thermostat device 18 when the room temperature has risen slightly above 60 degrees and the device 7$LwilLbe quickly moved to the off position breaking the circuit and cutting off the heat to the room or house from the furnace; The spring 57 will the predetermined hour, here six oclock A. i

be maintained in this last position due to the tension of the motor spring 118, the lever member 120 having moved in raising lever 48 to its position against stop lever 64 only part of the way toward sto 120.

When the clock mec anism has rotated lever 154 and cam pin 170, which projects to the rear of cam plate 155 and which there-' fore does not contact lever member 120 at any time during rotation, into engagement with the arm 135 of trip lever 133, the pin 170 will gradually rotate lever 133 on its pivot pin 132 in a clockwise direction. At

M., when the component of force of spring 57 exerted upon lever arm 36 is to be increased to require a relatively high or day temperature to expand the bellows wall 21 against the increased component of force of spring 57 in order to break the circuit at contacts 92, the arcuate arm 134 of trip lever 133 will act against release pin 129 to raise the dog 125 from engagement with ratchetteeth 122. Raising of dog 125 disengages spring 118 from shaft .101 and the force of the spring acts on lever member 120 to throw it the remainder of the way back against stop pin 120, carrying with it the pawl124 and causing the pawl 124 to be rotated on pin 123 against the force of tension spring 131 to maintain the dog 125 out of engagement with teeth 122. The dog .-125 is so held in order that the shaft 101 may rotate freely as the regulating lever 48 is adjusted along the slot 11 by the lever 65. Freedom of the shaft 101 from the holding force of spring 118 permits the regulating spring 57 to act as above described to pull lever 48 downward against stop portion proper 67. This downward movement of lever 48 which places it in the position of Figs. 1 and 2, increases the angle of application of the spring 57 upon lever arm 36, and consequently increases the component of force exerted thereby against expansion of the thermostat l8, and the COL- trol device is thus set to operate at the relatively high or day temperature first described. This completes a cycle of operation of the control device, and'continued rotation of the clock shaft 142 Will again bring lever 153 and cam roller 167 into contact with lever member 120 to function as above described. As the pin 170 leaves arm 135, the trip lever will swing-back on its fulcrum 132 to its initial position, due to the weight of arm 134 and spring 131.

It will thus be seen that we have provided a control device which'may be set to function at any desired temperature during one period, and at a different temperature tin! ing another period, and have also provided means to automatically set the control deselves to .such an element, as we may employ other types of thermostats, or pressureresponsive means for actuating the mechanism, without departing from the spirit and scope of our invention.

What we claim and desire to secure by Letters Patent of the United States is 1. A control device comprising a power element including a member movable in response to variations'in the characteristic of a liquid or gas, resilient means having a component of its force resisting movement of said member, said means being movable by said member to decrease the component, and means acting. ,on said resilient resisting means independently of the action of said member thereon to automatically vary the resistance of said resilient means to said member.

2. A control device comprising a pressure device including a .member movable in response to variation of pressure, resilient means having a component of its force resisting movement of said member, said means being movable by said member to decrease the component, and means acting on said resilient resisting means independently of said pressure device to automatically vary the resistance offered thereby to said member.

3; A control device comprising a pressure device including amember movable in re,- sponse to variation of pressure, resilient means having a component of its force re sisting movement of said member, said means being movable by said member to decrease thecomponent, and time-controlled means acting on said resilient resisting means to vary the resistance offered by said resilient resisting means to said member on the lapse of a predetermined time interval. I

4. A control device comprising a thermostat, a movable device operated by said thermostat, regulatable resilient means having a component of its force resisting operation of said device by said thermostat, said means being movable by said thermostat to decrease the component, and automatically operated meansacting on said resilient resisting means to control the resistance offered by said regulatable means to said thermostat.

5. A control device comprising a thermostat, a movable device, lever means opera tively connecting said device and said thermostat, regulatable means acting through said lever means to resist operation of said device-by said thermostat, automatically operated means acting on -said sregulatable means to regulate the resistance offered by said means to said thermostat, and means to limit the regulation of said regulatable means by said automatic means. 7

6. A control device comprising a support, an hermetically sealed chamber rigidly carried by said support and having aresilient movable wall, said chamber containing an expansible-contractible fluid, a device movfably carried by said support, lever means connecting said device to said wall for movementof said device in response to expansion and contraction of said fluid, regulatable re silient means acting through said lever means to resist movement of said'wall in one directlon, and means rigidly mounted on said support and connected to said regulatable means and being operable automatically to regulate the resistance. of said regulatable means to movement of said wall.

7. A control device comprising a temperature-responsive element, a movable device, lever means connecting said device to said element for movement thereby, regulatable resilient means acting. through said lever means to resist movement of said device by said element, means to regulate the resistance of said resilient means, time-controlled means, and means operable by said time-controlled means to actuate said regulating means.

8. A controldevice comprising a temperature-responsive element, a movable device connected to said element 'for movement thereby, regulatable resilient means connected to said element and resisting movement of said device by said element, means to regulate the resistance of said resilient means, time-controlled means, means operable by said time-controlled means to actuate said second-named regulating means, and means cooperable with said resilientmeans to limit the movement of said regulating means.

9. A control device comprising a thermostat, a support, a device fulcrumed on said support, lever means connecting said thermostat and said device whereby expansionof said thermostat rocks said device on its fulcrum, means having a regulatable resistanee and operatively engaging said lever means to oppose operation of said device by said thermostat, and time-controlled means periodically operative to regulate the resistance of said thermostat opposing means.

10. A control device comprising a thermostat, an element actuated in one direction by the thermostat, resilient means connected to and normally acting at an acute angle on said element and resisting operation thereof by said thermostat, and time-controlled means for-automatically varying the angle of application of the resistant force of said resilient means on said element, whereby operation of said element by the thermostat is regulated.

11. A control device comprising a thermostat, a lever actuated in one direction by the thermostat, resilient means-connected to said lever and resisting operation thereof by said thermostat, and time-controlled means for automatically varying the angle of application of the resistant force of said resilient .means on said lever, whereby operation ofperature-responsivemeans, means t0 COD- trol the resistance of said second-named means connected to said control means to automatically actuate the same, clockniechanism periodically actuating said last-named means, and means to limit said control means.

14-. A control device comprising a clock mechanism, pressure means, a device operated by said pressure means, means having-a variable resistance and resisting operation of said device by said pressure means, means to increase the resistance of'said resisting. means, and automatic means connected to said last-named means to operate the same, said clock mechanism ,being adapted to actuate said automatic means.

15. A control device comprising a thermostat, an element to be actuated by said thermostat, means connecting said thermostat and said element, movable means to regulate the actuation of said thermostat, a spring motor to move said last-named means, a clock mechanism, and means operated by said clock mechanism to cause the spring motor tomove said regulating means.

16. A control device comprising a support, a device movably carried by said support, temperature-responsive means connected to said device tomove the same, means having a variable resistance and opposing said temperature-responsive means, means to control the resistance of said second-named means, means connected to said control means to am tomatically actuate the same, .clock mechanism periodically actuating said last-named means, means to limit said control means, and means operated by sa1 d clock mechanism to release said controlllng means from said fourth named means.

17. A control device comprising a thermostat, an element to be actuated by said thermostat, means connecting said thermostat and said element, means to regulate the actu- ,ation' of said thermostat, .a spring motor having a spring connected to said last-named means to operate the same, a clock mechanism, and means operated by said clock mechanism to tension the spring of said motor and to cause the same to actuate said regulating means.

18. A control device. comprising athermostat, an element to be actuated by said there mostat, means connecting said thermostat and said element, means to regulate the actuation of said thermostat, a spring motor having a spring connected to said last-named means to operate the same, a clock mechanism, means operated by said clock mechanism to tension the spring of said motor and to cause the same to actuate said regulating means, and means operated by said clock mechanism to release the tension of said motor spring;

19. A control device comprising a thermostat, a lever operable by said thermostat, a spring acting on said lever to oppose operation thereof by said thermostat, said spring being arranged in position normally to exert its force along a line at an angle to said lever and normally to give a certain resistance to said thermostat, a clock mechanism, means controlled thereby to move said spring to decrease the resistance thereof to operation of said thermostat, and means controlled by said clock mechanism to permit said spring to assume said normal position.

20.- A control device comprising a thermostat, a lever operable by said thermostat, a spring exerting its force on and along a line at an angle to said lever, movable supporting means for said spring whereby said spring normally tends to assume a position of higher resistance to said thermostat, clock mechanism, and means operable by the clock mechanism'to move said spring-supporting means to cause said spring to assume a position of lesser resist-ance to said thermostat.

21. A control device comprising a thermostat a lever operable by said thermostat, a

spring exerting its force on and along a, line at anangle to said lever, movable supporting means for said spring, said spring normally tending to move said means whereby to assume a position of higher resistance to said thermostat, clock mechanism,means operable by the clock mechanism to move said springs upporting means in opposition to said spring to cause said spring to assume a position of lesser resistance to said thermostat, and means operable by the clock mechanism to permit said spring to assume said position of higher resistance. I

22. A control device comprising a support, anexpansible-collapsible element carried by 'said support, a lever, a second lever operable by said element, spring means havi'n its ends respectively engaging said levers an tending to urge said second lever into engagement with said element, a device fulcrumed on said support and engaged by said second lever for movement thereby, a clock mechanism, and means connecting said mechanism and said first-named lever to move said first-named lever to vary the force of said spring on said second-named lever. e

23. A control device comprising a support,

an expansible-collapsible element carried by saidsupport, a lever, a. second lever operable by said element, spring means having its ends respectively engaging said levers and tending to urge said second lever into engagement with said element, a device fulcrumed on said support and engaged by said second lever for movement thereby, a clock mechanism, means to regulate the force exerted by said s ring means, and means actuated by said 0 ock mechanism tooperate said regulating means.

24. A control device comprising a support, an expansible-collapsible element carried by said support, a lEVGI, a second lever operable by said element, spring means having its ends respectively engaging said levers and tending to urge said second lever into engagement with said element, a device fulcrumed on said support and engaged by said second lever for movement thereby, a clock mechanism, a spring motor, means connecting said motor and said first-named lever whereby actuation of said motor moves said lever on its fulcrum to vary the force of said spring on said second lever, and means operated by said clock mechanism to cause operation of said motor.

25. A control device comprising a thermostat, a lever fulcrumed adjacent one end, a second lever fulcrumed intermediate its ends, spring means connecting the free end of said first lever and one of the ends of said second lever, said second lever being operable by said thermostat, a device having a fulcrum support, the other end of said second lever engaging said device to rock the same on its fulcrum, a shaft,-a spring motor to rotate said shaft, means connecting said shaft and said first lever whereby said motor may move said first lever on its fulcrum to vary the force of said spring on said second lever, a

clock mechanism, means to tension the spring of said motor, and means operated by said clock mechanism to actuate said tensioning means and cause said motor to move said first lever. 26. A control device comprising a thermostat, a lever fulcrumed adjacent one end, a second lever fulcrumed intermediate its ends, spring means connecting the free end of said first lever and one of the ends of said second lever, said second lever being operable by said thermostat, a device having a fulrcum support, the other end of said second lever engaging said device to rock the same on its fulcrum, a shaft, a spring motor to rotate said shaft, means connecting said shaft and said first lever whereby said motor may move said first lever on its fulcrum to vary the force of said spring on said second lever, a clock mechanism, means to tension the spring of said motor, means operated by said clock mechanism to actuate said tensioning means and cause said motor to move said first lever, means to release the tension of said motor spring, and means operated by said clock mechanism to actuate said releasing means.

27. A control device comprising a thermostat, a lever fulcrumed adjacent one end, a

- second lever fulcrumed intermediate its ends,

spring means connecting the free end of said first lever and one of the ends of said second lever, said second lever being operable by said thermostat, a device having a fulcrum support, the other end of said second lever engaging said device to rock the same on its fulcrum, a shaft, a spring motor to rotate said shaft, means connecting said shaft and said first lever whereby said motor may move said first lever on its fulcrum to vary the force of said spring on said second lever, a clock mechanism, means to tension the spring of saidmotor, means operated by said clock mechanism to actuate said tensioning means and start said motor, means to release the tension of said motor spring, means operated by said clock mechanism to actuate said releasing means, and adjustable stops positioned on opposite sides of said first lever and adapted to limit movement thereof in clockwise and counter-clockwise direction respectively.

- 28. A control device comprising a pressure responsive means, a movable device operable by said responsive means, a spring opposing operation of said device by said means, a lever having a fixed fulcrum support independent of said responsive means and having operative connection with said spring whereby, to regulate the opposing force of said spring, and means to adjust said lever.

29. A control device comprising a base member, pressure responsive means rigidly fixed on said member and having a movable wall, a control means carried by said member and operatively connected to said wall, a

spring opposing operation of said control means by said responsive means, a lever having a fixed fulcrum support on said base member and having operative connection with said spring to adjust the opposing force thereof, and means to move said lever.

30. A control device comprising switch means operable to control an electric circuit and having a circuit-making position and a circuit-breaking position, pressure responsive means operatively connected to and for actuating said switch means to one of said positions, a clock mechanism, and means cooperable with said switch means and controlled by said mechanism, said last-named said switch means from said one position to the other of said positions and being operable automatically to effect return of said switch means to said one position upon the lapse of a predetermined time interval.

31. A control device comprising switch means operable to control an electric circuit and having a circuit-making position and a circuit-breaking position, temperature responsive means operable to movesaid switch means to circuit-breaking position, a clock mechanism, cam means driven by said clock means being operable to effect movement of mechanism, and means cooperable with said cam means and havlng operative connection with said switch means, sald cam means acting on said last-named means upon a predetermined lapse of time to effect movement of said switch means to circuit-making position and acting on said last-named means upon a predetermined further lapse of time to effect movement of said switch means to cirsuit-breaking position.

In testimony whereof we have hereunto signed our names.

LEWIS W. EGGLESTON. EARNEST J. DILLMAN. 

